| 摘要 |
<p>A line isolated current detector for detecting low frequency peak to peak currents on a high frequency chopped line (40) with a first series diode (11) and resistor (12) detecting positive waves and second series diode (21) and resistor (22) detecting negative waves. First and second capacitors (13, 23) across the first and second resistors (12, 22) respectively, temporarily store positive and negative detected waves. A third series diode (14) and resistor (15) connected in parallel across the first series diode (11) and resistor (12) and a fourth series diode (24) and resistor (25) connected in parallel across the second series diode (21) and resistor (22) allows faster charging and slower discharging of the capacitors (13, 23). This allows the capacitors to charge waveforms quick enough to use a high frequency current transformer (30) sensing a high frequency chopped line (40) and discharge waveform slow enough to reconstruct the low frequency waveform before high frequency chopping to allow accurate current measurements of direct current or low frequency currents using a current transformer.</p> |
